Draw-grip.



W. T. HANCOCK.

DRAW GRIP.

APPLICATION FILED 0502s. ms.

Patented June 26, 1917.

FIG. 5.. Jim.

[NI/EDITOR MAL/AM T/lll/VLDML.

MIT/YES sEs m: mums FE rzns 412.. PNUm-LI7HO wAsmunmN. a. c

trivia" WILLIAM T. HANCOCK, OF ANDERSON, INDIANA.

DRAW-GRIP.

Application filed December 28, 1916.

1 '0 all whom it may concern:

Be it known that I, WILLIAM T. HANoooK, a citizen of the United States, residing at Anderson, in the county of Madison and State of Indiana, have invented certain new and useful Improvements in Draw-Grips, of which the following is a specification.

This invention relates to improvements in devices for the loosening or drawing apart from their seated positions valve parts of internal combustion engines.

In engines or motors of this class, an accepted form of construction provides an arrangement of the valves operable directly in the head of the engine cylinder. This kind of a valve arrangement is shown in the an neXed drawings at Figure 5 and Fig. 6. In a suitably machined bore A in the upper portion of the cylinder body B is retained a metal cage C in which the spring sustained valve D is disposed, the stem head E of which valve is held in connected position by the removable pin F. This cage G is held in the said position by a securing ring G which is tightened against a wedge shaped packing ring H that closes the bore A and holds the cage securely at its place. In order to gain access to this valve and its seat for grinding or repairing same, the cage and its parts must be entirely removed from the position shown. On account of the eifects of heat and moisture and of carbonization, this cage, after a period of time, will have become afl'ected by corrosion to that extent, that the removing of same is very tedious and there is liability of damage and mutila tion of the parts.

To provide a device to facilitate the removal of this cage and its connected parts, is the object of this invention. Further purposes of the invention are to provide a device of this character which will be rugged and durable, not liable to get out of order, and which will be capable of economical manufacture.

The objects of the invention are accomplished by and the invention is embodied in the new construction, combination and arrangement of parts specified in this description, illustrated in the accompanying drawings, and defined in the appended claims.

The several parts of the device are identified by suitable characters of reference applied thereto, in the drawings, in which- Fig. 1 is a side view of my improved Specification of Letters Patent.

Patented June 2%, MML'X. Serial No. 139,256.

draw-grip, a cross section.

Fig. 2 is a sectional view taken on line 2-2 in the direction indicated by the arrow 2 in Fig. 1.

Fig. 3 is a plan view of the device.

Fig. 4 is a transverse sectional plan view taken on the line H in Fig. 1.

Fig. 5 is a view of the invention at position over the valve parts, the draw bar having been depressed and the hook-arms having engaged the stem-head.

Fig. 6 is a view similar to Fig. 5, showing the position of the several parts, after the operation of drawing the valve parts has been effected.

This invention contemplates the pro viding of a truss or support in which is arranged a loosely disposed bar capable of being projected toward the valve stem-head E, and having gripping means to engage the said stemhead, means to normally retain the bar in a retracted position, and a device combined with the said bar by which. the bar may be forced or drawn to retracted position while the gripping device retains its hold on the stem-head. While in this description the invention is shown as applicable to use upon a valve arrangement that is disposed vertically, it is apparent that the invention is of equal utility where its direction of operation is other than vertical.

The truss which is made of steel or iron flat bar has the transverse portion 1 and the legs 2 and 2 the feet of which are slightly enlarged as shown, to afford suitable bearing surfaces. draw bar 3 whose upper portion is threaded. On this draw bar 3 is the draw head 4:. This draw head 4 has its body portion hexagon shaped in CIOSs section and is also provided with the wings 4& so that it may be operated either by a wrench or by the hand of the user. In the underside of the draw head is a circular recess 4 which is occupied by the upper end of a coil spring 5. The lower end of this coil spring rests in a suitable circular recess 1 in the truss. The lower end 5 of the draw bar 5 is of enlarged cross section and is bifurcated to receive the ends of the hook-arms 6 and 6. These hook arms hang loosely on the cross pin 7. 8 designates a leaf spring which is of width and form to rest in the position shown with its ends bearing against the portion thereof being shown in In a hole 1 is loosely disposed a.

outer faces of the hook arms, and its central portion bearing against the top wall of the slot in which it rests. The function of this leaf spring is to urge the hook arms toward the closed position.

The hook-arms are of the peculiar shape shown in the drawing. The form of the noses of these hook arms may be plainly seen by reference to Fig. 1 and Fig. 4E, and is such that when the draw bar is shifted to the projected position, the inclined pilot faces (3 cause the hook arms to spread and pass the edges of the stem-head E, and the upper or engaging faces 6* are of such form, that by the action of the leaf spring 8, the hook arms snap to a closed engagement with the stem head. Transverse shift of the hook arms is impossible by reason of the curvature 6 of the noses of the hook arms. When the hook arms are so engaged the several parts of the device appear in the relative positions as shown in Fig. 5. The action of the spring 5 being to urge the draw head at upwardly, the engagement of the hook arms and the stein-head is maintained.

It will be understood of course that before the operation of drawing is to be done, the ring G will have been removed. My improved draw-grip having been applied to position for operating the same, the drawhead is rotated. By slightly turning same by the operators hand the stem-head is gripped tenaciously by the hook arms, then by applying the wrench to the draw head a draft or pull of such power is exerted, that the cage is drawn apart or free from its occupancy of the bore A. Having been thus drawn from the said position, the complete removal from the bore A is accomplished by simply grasping the truss at position as shown at Fig. 6 and lifting same; then by spreading apart the hook arms 6 and 6 their engagement of the stem-head is released. By the action of the spring 8 the hook arms are retracted, and then by turning back the draw head a on the draw bar 3 the device is again in readiness for use as shown in Fig. 1.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A draw grip, comprising a truss, a bar loosely carried by the truss, gripping means carried by the bar, a spring to maintain the bar at retracted position, and means to draw the said bar.

2. A draw grip, comprising a truss, a bar carried loosely by the truss and being threaded, hook arms carried by the said bar, a draw-head nut on said bar, and means to maintain the said bar at retracted position.

3. A draw grip, comprising a truss frame, a threaded bar carried loosely in the'truss frame, hook arms carried by the threaded bar having their ends so formed that the hook arms will spread when they make contact with the object to be moved, a spring to urge said hook arms toward each other, a draw-head nut on said threaded bar, and a spring to maintain the said bar at retracted position.

In testimony whereof I affix my signature in the presence of two witnesses.

WILLIAM T. HANCOCK.

Witnesses IRA J. YOUNG, TrrouAs L. RYAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G. 

